How to Deep Clean a Commercial Kitchen: A Step-by-Step Checklist

A missed health inspection doesn't just cost you a fine. It can cost you your licence, your reputation, and in serious cases, your business.

Most commercial kitchens are cleaned every day. Surfaces get wiped, floors get mopped, and fryers get skimmed after service. But daily cleaning and deep cleaning are not the same thing, and confusing the two is one of the most common and costly mistakes in food service operations.

Grease accumulates in places that daily cleaning never reaches. Bacteria take hold in drains, door seals, and the underside of equipment. Exhaust hoods clog with fat deposits that become a genuine fire risk. None of that gets addressed by the end-of-service wipe-down.

This guide gives you a complete, step-by-step checklist for how to deep clean a commercial kitchen properly, covering every zone, every surface, and every piece of equipment your team needs to tackle. Whether you manage a restaurant, hotel kitchen, catering operation, or food production facility, this is the process to follow.

Deep Cleaning vs. Daily Cleaning: What's the Difference?

Understanding the distinction between routine cleaning and deep cleaning is the foundation of any good kitchen hygiene programme.

Daily cleaning keeps the kitchen operational and hygienic between services. It covers the surfaces your team interacts with constantly: cooking tops, prep benches, fryer baskets, and floors. Done right, it prevents cross-contamination and maintains a presentable working environment.

Deep cleaning goes further. It involves dismantling equipment to clean internal components, moving units to scrub behind and underneath them, descaling water-contact surfaces, degreasing exhaust hoods, and sanitising areas that daily cleaning physically cannot reach.

The distinction matters because grease buildup in extraction systems is a leading cause of commercial kitchen fires. Bacteria thrive in floor drains, refrigerator door gaskets, and the undersides of shelving units. None of these risks are neutralised by daily wiping and mopping alone.

Throughout this guide, cleaning tasks are organised into three frequencies:

• Daily tasks: completed after every service or at the end of each day

• Weekly tasks: completed once a week during a quieter period or before a rest day

• Monthly tasks: scheduled deep clean covering equipment internals, extraction systems, and behind-unit areas

How Often Should You Deep Clean A Commercial Kitchen?

The right frequency depends on your kitchen's volume, but the framework below applies to most food service operations.

High-volume operations, including hotel kitchens, hospital canteens, and large restaurant groups, may need to move some monthly tasks to a fortnightly schedule. When in doubt, clean more frequently rather than less. Health inspectors do not accept a calendar as an excuse.

What You Need Before You Start: Equipment And Supplies Checklist

Before the deep clean begins, gather everything your team will need. Stopping mid-clean to locate a product wastes time and disrupts the process. Have all supplies staged and ready.

Cleaning chemicals

The right chemicals make the difference between a surface that looks clean and one that actually is.

• Degreaser: a heavy-duty commercial degreaser is essential for cooking equipment, exhaust hoods, and wall tiles. Choose a product formulated for food-service environments and verify that it is safe for the surfaces you are treating.

• Sanitiser: a food-safe sanitiser for all food contact surfaces, including prep benches, cutting boards, and equipment that touches ingredients. Always follow dilution instructions and contact time guidelines.

• Descaler: for areas with limescale buildup, including steamers, dishwashers, and water-contact equipment.

• Drain cleaner: a commercial-grade drain cleaner or enzyme-based product for floor drains and sink traps.

Scrubbing tools

• Heavy-duty scrub pads for cooking equipment and tile surfaces

• Stainless steel brushes for grill grates and stubborn carbonised residue

• Grout brushes for tile joints and textured surfaces

• Microfiber cloths for wiping down sanitised surfaces without leaving lint or streaks

Mops and floor equipment

Commercial kitchen floors require a heavy-duty approach. A looped-end string mop or a spin mop with a large-capacity bucket handles the volume and the type of soiling typical in food service environments. Avoid flat mops for kitchen deep cleans as they are not built for the grease loads involved.

A floor scrubber or deck brush is useful for scrubbing tile grout and heavily soiled areas before mopping.

PPE

Chemical safety is not optional. Equip your team with:

• Chemical-resistant gloves

• Safety goggles or a face shield when using concentrated degreasers

• Non-slip, waterproof footwear

• Aprons or coveralls for prolonged chemical exposure

Never mix cleaning chemicals unless the product instructions explicitly permit it. Mixing bleach-based sanitisers with ammonia-based degreasers produces toxic fumes.

A note on colour coding: assign dedicated colour-coded tools to each zone of the kitchen, separate colours for cooking areas, prep areas, and washrooms. This prevents cross-contamination between zones and is a standard requirement in many food safety audit frameworks.

Step-by-step commercial kitchen deep cleaning checklist

Work through the kitchen systematically, always moving from high surfaces to low, and from dry tasks to wet. This prevents cleaned surfaces from being re-contaminated by debris falling from above.

Step 1: Clear and prep the kitchen

Before any cleaning begins, the kitchen needs to be prepared properly.

• Remove all food from prep surfaces and store it safely in covered containers in refrigerated storage

• Allow cooking equipment to cool completely before handling

• Drain fryers and remove fryer oil for disposal or recycling according to your waste management process

• Cover electrical panels, outlets, and any equipment that cannot be exposed to water or cleaning chemicals

• Remove all loose items from surfaces, shelving, and the floor area

• Scrape away any large food debris from surfaces before applying chemicals

Step 2: Degrease cooking equipment

Cooking equipment accumulates the heaviest grease and carbon deposits in the kitchen, making it the most demanding part of the deep clean.

• Apply a heavy-duty commercial degreaser to ovens, grills, fryers, ranges, and flat-tops

• Allow the degreaser to dwell for the time specified on the product label (typically 5 to 15 minutes). Do not skip or shorten the dwell time, as this is when the product breaks down grease at a chemical level.

• Scrub all surfaces using appropriate tools: stainless steel brushes for grates and burners, scrub pads for flat surfaces

• Remove oven racks and grill grates separately and soak them in a degreaser solution

• Rinse all surfaces thoroughly with clean water and wipe dry

• For fryer vats, scrub the interior with a fryer brush and rinse multiple times to remove all chemical residue before refilling

Step 3: Clean exhaust hoods and filters

Exhaust hoods are the most overlooked and one of the most important components in commercial kitchen fire safety.

• Remove baffle filters or mesh filters from the hood canopy

• Soak filters in a hot water and degreaser solution for 15 to 30 minutes

• Scrub filters with a stiff brush to remove all grease deposits, then rinse thoroughly and allow to dry completely before reinstalling

• Wipe down the interior of the hood canopy with a degreaser-soaked cloth, paying particular attention to the corners and joints where grease pools

• Wipe down the exterior surfaces of the hood

• Check the condition of filters and replace any that are damaged or excessively worn

If your extraction ducting has not been professionally cleaned in the past 12 months, schedule a duct cleaning service. This is a specialist task that cannot be completed with standard cleaning equipment and is a requirement under most commercial insurance policies.

Step 4: Sanitise prep surfaces and countertops

All surfaces that contact food must be sanitised, not just cleaned. Cleaning removes visible soil; sanitising reduces bacterial contamination to safe levels.

• Wipe all prep surfaces with a food-safe degreaser to remove grease and residue

• Rinse with clean water

• Apply a food-safe sanitiser at the correct dilution, following the manufacturer's instructions for contact time (typically 30 to 60 seconds)

• Allow surfaces to air dry or wipe with a clean, lint-free cloth

• Pay particular attention to cutting board surfaces, knife storage areas, and any grooves or joins in countertop surfaces where bacteria can harbour

Step 5: Clean refrigerators and cold storage

Refrigerators and cold storage units require a thorough clean at least once a week, with a more detailed deep clean monthly.

• Remove all contents from the refrigerator and check expiry dates as you go

• Remove shelving and drawers, and wash them in hot, soapy water

• Wipe down all interior surfaces with a food-safe sanitiser

• Pay close attention to door gaskets, which are a common site for mould and bacterial growth. Use a small brush to clean the folds of the gasket thoroughly.

• Check that the drain hole at the base of the interior is clear and free from debris

• Wipe down exterior surfaces, including the top of the unit, which collects grease and dust

• Allow the interior to dry fully before restocking

Step 6: Scrub walls and tiles

The wall areas around cooking equipment accumulate grease splatter rapidly, particularly in high-heat zones around fryers and ranges.

• Apply degreaser to all tiled wall surfaces in cooking and prep zones

• Allow to dwell, then scrub with a grout brush or stiff pad

• Pay particular attention to the grout lines between tiles, where grease and food debris are most difficult to remove

• Rinse walls with clean water and wipe down

• Check silicone seals around tiled areas and replace any that are cracked, discoloured, or no longer forming a waterproof seal

Step 7: Clean floor drains

Floor drains are one of the highest-risk areas for bacterial contamination and blockages in any commercial kitchen.

• Remove drain covers and scrub them with a brush and degreaser

• Pour a commercial drain cleaner or enzyme product into each drain according to product instructions

• Use a drain brush to scrub the interior of the drain body

• Flush with hot water

• Replace drain covers and ensure they are seated correctly

• If any drain is slow to clear or producing odours after cleaning, arrange for a plumber or drainage specialist to inspect it

Step 8: Mop floors

Mopping is always the final step in the deep clean sequence. Doing it earlier means the floor will be recontaminated by debris falling from surfaces cleaned afterwards.

• Sweep or vacuum all floor areas thoroughly before any water touches the floor

• Apply a commercial kitchen floor cleaner to the mop bucket at the correct dilution

• Mop in sections, working from the back of the kitchen toward the exit

• Use a floor scrubber or deck brush on heavily soiled areas and around floor drain surrounds before mopping

• Change the mop water if it becomes heavily soiled before the area is complete

• Allow the floor to dry fully before the kitchen reopens. Wet kitchen floors are a significant slip hazard.

Common deep cleaning mistakes to avoid

Even experienced kitchen teams make these mistakes. Knowing them in advance prevents rework and potential hygiene failures.

Using the wrong chemical concentration. Too weak and the product is ineffective. Too strong, and you risk damaging surfaces, leaving harmful residue on food-contact areas, or creating safety risks for staff. Always follow the dilution instructions on the product label.

Skipping dwell time. Applying a degreaser and immediately wiping it off is one of the most common errors in commercial kitchen cleaning. The product needs time to chemically break down grease before it can be removed. Skipping the dwell time means scrubbing harder for worse results.

Cleaning out of order. Always clean from top to bottom and from dry to wet tasks. Scrubbing down walls after you have mopped the floor means the floor will need to be mopped again. Work systematically and sequence tasks correctly the first time.

Forgetting drains and under-equipment areas. These are the areas where grease and bacteria accumulate most heavily and the areas most commonly missed during deep cleans. Schedule them explicitly in your cleaning rota, not as an afterthought.

Cross-contaminating between zones. Using the same mop, cloth, or scrubbing pad in the cooking zone and then in the food prep zone transfers bacteria from one area to another. Colour-coded tools per zone are the simplest and most effective way to prevent this.

Building A Cleaning Schedule Your Team Will Actually Follow

A cleaning checklist is only as effective as the system around it. Writing the checklist is the easy part. Getting a team to follow it consistently, especially during busy periods, requires a different approach.

Assign tasks by role, not by shift. When a task belongs to a named role, there is clear accountability. When it belongs to "whoever is on shift," it tends not to get done. Make each task someone's responsibility.

Post the checklist in the kitchen. A laminated checklist on the wall gets used. A checklist in a folder in the office does not. Make the reference material available at the point of work.

Tie frequency to volume, not just the calendar. A quiet midweek kitchen and a fully booked Friday night service create very different levels of soiling. High-volume days may require more frequent attention to fryers, drains, and extraction than the standard weekly schedule accounts for.

Keep supplies stocked and accessible. Staff cannot follow a cleaning process if the products they need are not available. Designate a clearly labelled cleaning station with all necessary chemicals, tools, and PPE, and restock it before it runs out rather than after.

A well-run commercial kitchen is built on systems, and cleaning is one of the most important systems you operate. The checklist above gives you the foundation. Consistency and accountability turn it into a standard.

Final Thoughts

A clean commercial kitchen is not just the absence of visible dirt. It is a documented, repeatable process that protects your staff, your customers, and your business from risks that cannot always be seen.

Deep cleaning done properly takes time, the right products, and a team that understands why each step matters. Build it into your operations as a non-negotiable standard, not something scheduled around busy periods.

Ready to equip your kitchen for a proper deep clean? Browse our full range of commercial kitchen cleaning supplies and equipment, from heavy-duty degreasers and sanitisers to mops, brushes, and floor-care solutions built for food-service environments.

Need help choosing the right products for your kitchen setup? Get in touch, and we will help you put together the right kit.